#region WatiN Copyright (C) 2006-2008 Jeroen van Menen

//Copyright 2006-2008 Jeroen van Menen
//
//   Licensed under the Apache License, Version 2.0 (the "License");
//   you may not use this file except in compliance with the License.
//   You may obtain a copy of the License at
//
//       http://www.apache.org/licenses/LICENSE-2.0
//
//   Unless required by applicable law or agreed to in writing, software
//   distributed under the License is distributed on an "AS IS" BASIS,
//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//   See the License for the specific language governing permissions and
//   limitations under the License.

#endregion Copyright

using System;
using WatiN.Core.Interfaces;

namespace WatiN.Core.Constraints
{
	public class NotConstraint : BaseConstraint
	{
		private BaseConstraint _baseConstraint;

		public NotConstraint(BaseConstraint baseConstraint) 
		{
			if (baseConstraint == null)
			{
				throw new ArgumentNullException("baseConstraint");
			}

			_baseConstraint = baseConstraint;
		}

		/// <summary>
		/// Does the compare without calling <see cref="BaseConstraint.LockCompare"/> and <see cref="BaseConstraint.UnLockCompare"/>.
		/// </summary>
		/// <param name="attributeBag">The attribute bag.</param>
		protected override bool DoCompare(IAttributeBag attributeBag)
		{
			return !(_baseConstraint.Compare(attributeBag));
		}

		public override string ConstraintToString()
		{
			return "Not '" + _baseConstraint.ConstraintToString() + "'";
		}
	}
}